A performance analysis of optical overlapping PPM-CDMA communication systems

Shalaby, Hossam M. H.

doi:10.1109/50.749382

Cited by 52 publications

(36 citation statements)

References 14 publications

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“…To use the same information bit rate, S b sets the number of chips. Figure 4 shows the BER performance versus the average number of received photons per bit of the OOK-CDMA system, the OOK-TH-CDMA system, and the proposed system with (16,5,8) eBCH codes and (15, 5, 7) BCH codes. The number of active users N equals N max and N = N max = 10.…”

Section: Performance Of Proposed Systemmentioning

confidence: 99%

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Use of optical orthogonal codes with 2‐PPM and BCH codes for time‐hopping optical CDMA system

Iwata

Sawagashira

Sonoda

et al. 2003

Electron. Comm. Jpn. Pt. I

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SUMMARYIn this paper, we propose the use of 2-PPM for time-hopping optical code division multiple access (CDMA) where the transmission bits are embedded in the weighted positions of signature sequences. To use 2-PPM, each chip is composed of two slots, and an optical pulse is transmitted in either slot, according to a bit transmitted in the corresponding weighted position. In the receiver, threshold detection is used, which makes bits that have suffered multiple access interference (MAI) erasure bits. By using codeword bits of the BCH codes for the transmitted bits, the effect of MAI is removed in the decoding of BCH codes. Since the effect of MAI is treated as erasure bits, the proposed method reduces the effect of MAI more than the decoding procedures treating them as error bits. In addition, the use of extended BCH (eBCH) codes allows us to reduce the effect of MAI more efficiently. We analyze the bit error rate (BER) of the proposed system, assuming that the photodetector outputs follow the Poisson distribution. The numerical results show that the proposed system achieves better BER performance than the system without Manchester signaling.

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Section: Performance Of Proposed Systemmentioning

confidence: 99%

“…The BER performance of the OPPM-CDMA system is given in Ref. 8. We also compare the performance to OOK-TH-CDMA systems.…”

Section: Performance Of Proposed Systemmentioning

confidence: 99%

Use of optical orthogonal codes with 2‐PPM and BCH codes for time‐hopping optical CDMA system

Iwata

Sawagashira

Sonoda

et al. 2003

Electron. Comm. Jpn. Pt. I

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“…Many alternatives have been proposed that operate with a smaller bandwidth expansion, Zwillinger (1988), Shiu & Kahn (1999) & Shalaby (1999. Of these, multiple PPM (Sugiyama & Nosu (1989), Atkin & Fung (1994), Park & Barry (1995), Park & Barry (1996) & Park & Barry (2003)) and dicode PPM ) appear to offer the lowest bandwidth expansion.…”

Section: Coding Schemesmentioning

confidence: 99%

Pulse position modulation coding schemes for optical intersatellite links

Ghosna

Sibley

2010

Electron. Lett.

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“…The primary advantage of PPM is its ability to perform M-ary signaling, allowing for higher data throughputs than OOK. However, difficulty in implementing the comparison test has thus far limited PPM/O-CDMA to mostly theoretical studies [3][4][5][6][7][8] . In fact, the few existing implementations of PPM/O-CDMA avoid the comparison test altogether and continue to rely on thresholding 9 .…”

Section: Introductionmentioning

confidence: 99%

“…Although many O-CDMA schemes exist, the majority of schemes encode optical pulses, and these pulses are on-off-keyed (OOK) with binary data 2 . Due to its use of pulsed signaling, pulse position modulation (PPM) lends itself nicely as an alternative to OOK in O-CDMA [3][4][5][6][7][8] . In PPM, data symbols are represented as pulses that occupy one of M possible slots within a frame.…”

Section: Introductionmentioning

confidence: 99%

Design and evaluation of a virtual quadrant receiver for 4-ary pulse position modulation/optical code division multiple access (4-ary PPM/O-CDMA)

Mendez¹,

Hernandez

Gagliardi

et al. 2007

SPIE Proceedings

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M-ary pulse position modulation (M-ary PPM) is an alternative to on-off-keying (OOK) that transmits multiple bits as a single symbol occupying a frame of M slots. PPM does not require thresholding as in OOK signaling, instead performing a comparison test among all slots in a frame to make the slot decision. Combining PPM with optical code division multiple access (PPM/O-CDMA) adds the benefit of supporting multiple concurrent, asynchronous bursty PPM users. While the advantages of PPM/O-CDMA are well known, implementing a receiver that performs the comparison test can be difficult. This paper describes the design of a novel array receiver for M-ary PPM/O-CDMA (M = 4) where the received signal is mapped onto an xy-plane whose quadrants define the PPM slot decision by means of an associated control law. The receiver does not require buffering or nonlinear operations. In this paper we describe a planar lightwave circuit (PLCs) implementation of the receiver. We give detailed numerical simulations that test the concept and investigate the effects of multi-access interference (MAI) and optical beat interference (OBI) on the slot decisions. These simulations provide guidelines for subsequent experimental measurements that will be described.

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A performance analysis of optical overlapping PPM-CDMA communication systems

Cited by 52 publications

References 14 publications

Use of optical orthogonal codes with 2‐PPM and BCH codes for time‐hopping optical CDMA system

Use of optical orthogonal codes with 2‐PPM and BCH codes for time‐hopping optical CDMA system

Pulse position modulation coding schemes for optical intersatellite links

Design and evaluation of a virtual quadrant receiver for 4-ary pulse position modulation/optical code division multiple access (4-ary PPM/O-CDMA)

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